Work-holder for machine-tools.



PATENTEDOCT. so, 1906. c. o. M. MORTBNSEN.

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'UNITED sTATEs PATENT oEEroE.

CASPER C. M. MORTENSEN, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Oct. 30, 1906.

Application filed April 11, 1904. Serial No. 202,633.

Beit known that I, CASPER C. M. MOETEN- .sEN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Work-Holders for Machine-Tools, of which the following is a specification. j

The present invention relates to clamping devices for securing blocks or other pieces of Work to the platen or other support of a machine-tool, and has for its object the provision of a device of this character which shall be capable of adjustment to clamp the Work with greater or less force upon the platen or support of the machine-tool, yreadily adaptable for use in connection with a large variety of work, and of sim ler and less expensive construction than t edevices heretofore in use for accomplishing thesame function.

For a more complete understanding of my invention reference may be made to the following detailed specification and the accom-l panying drawings, forming a part thereof, in whichl Figure 1 is a front side elevation of a boring-mill having attached thereto a workholder embodying my invention. Fig. 2 is a top plan of the work-holder. Fig. 3 is a side elevation of a clamping-disk, and Fig. 4 is a vertical section of a modified form'of clamping-disk. j

The boring-mill is provided, as usual, with a cross-bar 1, upon which are carried t'wo tool-posts 2', and beneath the cross-bar and tool-posts is arranged a revoluble platen or table 3, having radial grooves 4 in its upper surface for the reception of the strap-bolts ordinarily employed in securing the work in lace thereon. Upon the platen or table 3 secure by bolts 5 a heavy form 6, having` longitudinal bolt-grooves 7 and side shoulders or projections 8, through -which are,

screwed set-bolts 9 at an acute angle to the surface of the form, so that their points will move downwardly toward the surface as they are screwed inwardly, thereby effecting a clamping action of the pieces of Work 1() upon the surfaceof the form.

The pieces of work 10 are shown as straight bars of iron of rectangular cross-section; but my clamping device is designed'for use in connection with curved and irregularlyl shaped pieces as well. Between the adjacent edges of the pieces of work I place clamping disks or members 11, having peripheral knife-edges 12, rrade by turning off the opposite corners to form frusto-conical surfaces with their larger ends joined, and provided with axial apertures 13, through which pass the bolts 14, by which they are clamped to the form. By screwing the bolts 9 upon the outer edges of the pieces of work 10 their points become embedded therein and operate to force them into engagement with the surface of the form 6, and at the same time the several pieces of work are crowded together, causing the knife-edges 12 of the clamping-disks 11 to embed themselves in the adjacent sides of the workpieces; Then by tightening u the bolts 14 the disks -11 and the interme iate pieces of work 10 are positively forced into engagement with the surface of the form.

In order that the clamping-disks 11 may be yieldingly supported away from the surface of the form, I provide iieXible washers 15, of rubber or other suitable material, which readily yield when the bolts 14 are tensioned.

In certain caseswhere the thickness of the metal pieces Worked upon is slight or such that the tool would'ordinarily engage the upper ends of the bolts 14 clamping-disks having countersinks 16 in their upper ends, as shown in Fig. 4, ma be used. The pieces of work 10 are held fiom longitudinal movement by blocks 17 and vkeys 18.

It is apparent that the form 6 might be omitted and the several clamping members secured directlto the table or platen of the machine-tool, particularly when the work` done was light and the table or platen provided With a sufficient number of boltgrooves 4 to permit the clamping-bolts 14 to be `disposed advantageously.

I do not desire to restrict myself to the particular form or construction of parts herein described and shown, for it is apparent that they may be changed and modified without departing from my invention.

So l

IOO

What I claim as new,l and desire to secure ment with both of said knife-edges, and means for forcing said clamping member toward the surface of the machine-tool.

2. In a multiple work-holder for machinetools, the combination of a plurality of clamping members each provided on opposite sides with knife-edges, means for forcing the work into engagement with said knifeedges, and means for forcing said clamping menbers toward the surface of the machinetoo 3. In a multiple work-holder for machinetools, the combination of a clamping member provided with a peripheral knife-edge, means member and provided with a nut located within the countersunk recess.

5. In a multiple Work-holder for machinetools, the combination of a form having shoulders or projections on opposite sides, bolts threaded in said shoulders or projections at an angle to the surface of said form, and clamping members having knife-edges on their opposite sides and secured to said form between said shoulders or projections.

6. In a work-holder for machine-tools, the combination of a form having shoulders or projections on opposite edges, bolts threaded in said shoulders or projections at acute angles to the surface of said form, clampingdisks located between said shoulders or projections, and means for forcing said disks toward the surface of said form after the work has been forced into engagement therewith by means of the said bolts.

In witness whereof I have hereunto set my hand this 8th day of April, 1904.

CASPER C. M. MORTENSEN.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

